Finite Element Analysis of Proximal Femur Nail for Subtrochanteric Fractured Femur

The aim of the present work is to study the biomechanical behavior of the femur implant assembly during fixation of a simple transverse subtrochanteric fractured femur using a commonly known implant called Proximal Femur Nail (PFN). Finite element Analysis tool is used to study the bio-mechanical behavior of the femur and the implant assembly. The “standardized femur” is downloaded from repository of the Society of Bio-Mechanical Engineers and subsequently repaired to make it usable for this Finite Element Simulation. The modeling software Unigraphics and finite element simulation software ANSYS are used for the present study. A simple transverse subtrochanteric fracture located 30mm below the lesser trochanter is modeled using contact elements for this present study. A static linear finite element analysis is performed to study the intact femur. A non-linear contact analysis is performed to study the fractured femur with implant assembly. The implant is studied for deflection, stress and strains. The present work has considered the full femur and modeled with non-homogeneous material properties for the bone material. The displacement and principle stress on the proximal femur have been compared with the intact model. The contact results are used to estimate the condition of healing process at the fracture interface.

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